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When selecting an 40.5KV Vacuum Circuit Breaker for outdoor power distribution, reliability under harsh conditions is the deciding factor. Our units are designed as true Outdoor Vacuum Circuit Breaker solutions, integrating vacuum interrupter technology that eliminates the need for oil or SF6 gas. This approach simplifies maintenance and boosts environmental compliance. Engineers specifying a 35KV Substation Circuit Breaker will recognize the common platform, as our outdoor range shares core mechanisms with proven substation models. For installations demanding elevated performance, the unit also qualifies as a High Voltage Vacuum Circuit Breaker, built to handle frequent switching operations without contact erosion. Every breaker undergoes rigorous type-testing, including temperature rise, short-time withstand current, and dielectric tests, ensuring compliance with IEC 62271-100. The sealed interrupters and robust mechanism housing ensure decades of dependable service in coastal, desert, or high-altitude environments.
Outdoor Power Distribution Circuit Breaker configurations are available for rated voltages from 12kV to 40.5kV, covering a wide spectrum of distribution networks. Each unit features a galvanized steel enclosure with C5-M corrosion protection as standard, making it suitable for extreme weather. The operating mechanism is a motor-driven spring type, allowing both manual and remote electrical closing and tripping. Clear external indicators show spring charge status and breaker position. Below is a detailed parameter table for our main 35/40.5kV offering, which represents the most common outdoor feeder application.
The following table summarizes typical performance across our outdoor vacuum circuit breaker family.
| Parameter | 12kV Model | 24kV Model | 36kV Model | 40.5kV Model |
|---|---|---|---|---|
| Rated voltage (kV) | 12 | 24 | 36 | 40.5 |
| Rated current (A) | 630/1250/2000 | 630/1250/2000 | 630/1250/2000 | 630/1250/2000 |
| Rated breaking current (kA) | 20/25/31.5 | 20/25/31.5 | 20/25/31.5 | 20/25/31.5 |
| Power frequency withstand (kV) | 42 | 65 | 85 | 95 |
| Lightning impulse withstand (kV) | 75 | 125 | 170 | 185 |
| Mechanical life (operations) | 10,000 | 10,000 | 10,000 | 10,000 |
| Weight approx. (kg) | 450 | 520 | 600 | 680 |
Secondary wiring is terminated on a well-labeled terminal block inside a weatherproof auxiliary compartment. Standard protection relays can be integrated easily, and CTs are mounted on the bushings to provide signals for overcurrent, earth fault, and differential protection. The bushings are cycloaliphatic epoxy resin with silicone rubber sheds, offering hydrophobicity and high track resistance. For online monitoring, optional sensors for partial discharge, contact temperature, and spring status can be factory-installed. The trip-free mechanism ensures that the breaker cannot be held closed against a fault, and manual trip buttons are accessible through the locked door for emergency operation without exposing personnel to live parts. Assembly and commissioning are straightforward: the breaker arrives as a single, factory-tested unit that can be lifted onto a concrete pad or steel structure using four lifting eyes. All adjustments are factory-set; only control power and primary cable connections are required on site.
